A missing or overlooked minus sign changes the meaning of the temperature completely. Check the unit and complete characters rather than reading only the digits.
What the observation tells you
Condensation, a failed display segment or an angled photograph can make the sign difficult to see. The screen may also show a target rather than a current measurement. Do not respond to an uncertain display by repeatedly changing settings.
A useful next step
Use the manual's display guide and a suitable independent temperature check if needed. If part of the screen is defective, report that separately and protect food while actual conditions are clarified.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.